Antonym of prejack, postjack is the capacity, (exclusive to men), to think clearly, make responsible purchase decisions, refuse to comply with the suggestions of hot women, do math, and pass strip clubs without going inside. Typically a momentary, fleeting state that goes away a few minutes "postjack".

Postjack it’s pretty clear to me how much I hate that fucking couch she made me buy, and how – frankly – I’d really like to strangle her goddamn cat… but the feeling usually subsides after a couple minutes, confusion sets in, and I have to go look for my calculator and a dictionary… wait, what was I talking about? I need to go look at redtube.